"They're not good enough to hack into our system and steal any of our data," police spokesman Dechnarong Suthicharnbancha said.

In a 37-minute video posted on the Anonymous Facebook page on Sunday, a masked person questioned the competency of the Thai police force and its handling of this and other cases.

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On December 24, a Thai court found Zaw Lin and Win Zaw Htun, both 22, guilty of killing Hannah Witheridge, 23, and David Miller, 24, whose battered bodies were found on a beach on the southern Thai holiday island of Koh Tao in 2014.

The investigation into the killings drew allegations of police incompetence, torture and mishandling of evidence. A judge dismissed the allegations of torture, saying there was no evidence it took place.